Well it's day 21 and these babies are flourishing. They seem to have recovered from their transplanting quickly and even the two that were planted sans mycorrhiza are coming on. They're growing much faster than the previous grow was at this stage, and I now know that that's because I wasn't giving them enough water last time.
However, the plant that had its roots damaged because I tried to replant it, is growing very slowly and I don't think it's going to catch up with the others. I'll keep growing if for the meantime but if that turns out to be the case I will toss it so that I can grow 9 plants symmetrically in 3 rows of 3.
Today was their first feed and I managed to fuck that up. I did run a test on another pot with the same medium, to see how much water I should be giving them, and my calculation was approximately 4 litres. That seemed way too much because that isn't much less than the 5 litres I was giving the 5 gallon pots for my last grow. I ignored my instinct like a fucking idiot, and settled on 3 litres in the end, but even that was way too much.
I gave them all a litre each to begin with. Then when I had given another 6 pots their second round of 1 litre, I noticed lots of runoff coming out the bottom. I didn't measure this exactly but it looked like it was over half a litre in some of the trays, which would equate to approximately 25% of the 2 litres I'd given them, and clearly way too much runoff. I think in actual fact I should only be giving them only about 1 litre of water.
So how the fuck did the same medium give me about 400 millilitres (10%) of runoff from 4 litres of water when I ran a test? Is it because some of the soil was really dry? I'd stored the bags outside my house in the shade but maybe the climate in Thailand is too hot for that and it dried the soil out?
So, for the first watering and the first feed I have given them too much water. I don't think it was much of a problem with the first watering because this will have given the medium a good soaking so the roots will grow into it, (I learnt that one from you Trash) but for the 6 plants that got overwatered today, there might be some damage. Not only have they had too much water but the concentration of the feed might be too high for them? However, thinking about it, if you use the same ratio of feed for a larger amount of water then the concentration will be the same won't it? I gave them Dutch Pro veg fertiliser with
CalMag, Take Root and Multi Total, at an EC of 1.2 and adjusted to 6.2 PH.